Lect_12_note

# Lect_12_note - Chapter 28 Direct Current Circuits...

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Chapter 28 Direct Current Circuits

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Kirchhoff’s Rules ± Junction Rule The sum of the currents entering any junction must equal the sum of the currents leaving that junction Σ I in = Σ I out Charge conservation!
Kirchhoff’s Rules ± Loop Rule The sum of the potential differences across all the elements around any closed circuit loop must be zero closed loop 0 V ∆= Energy conservation!

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Resistors in Series ± Junction Rule : The currents are the same in all the resistors ± Loop Rule : The total potential difference across the two resistors is equal to the voltage of the battery. ± Δ V = I R 1 + I R 2 = I ( R 1 + R 2 )
Series ± R eq = R 1 + R 2 + R 3 + … ± The equivalent resistance of a series combination of resistors is the algebraic sum of the individual resistances and is always greater than any individual resistance ± If one device in the series circuit creates an open circuit, all devices are inoperative

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Resistors in Parallel ± Junction Rule : The current, I , that enters a point must be
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Lect_12_note - Chapter 28 Direct Current Circuits...

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